Telephone-circuit.



No. 699,676. Patented May I3, I902;

I G. E. GUUDHEAD.

TELEPHONE CIBCUlT.

(Application filed June 14, 1900.) (No Model.) ZSheets-Sheef l.

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:rEORGE E. GOODHEAD, OF I/VINCIIESTER, ILLINOIS.

TELEPHONE-CIRCUIT.

SPECIFICATION forming part of Letters Patent No. 699,676, dated May 13, 1902. Application filed June 14, 1900. Serial No. 20,289- (No model.)

To aZZ whom it may concern.-

Beitknown that I, GEORGE E. GOODHEAD, a citizen of the United States, and a resident of Winchester, in the county of Scott and State of Illinois, have invented a new and Improved Telephone-Circuit, of which the following is a full, clear, and exact description.

This invention relates particularly to telephone-circuits so arranged as to practically prevent a party at an intermediate station from listening or hearing the conversation between parties at other instruments; and the object is to provide a telephone-circuit embodying simplicity in arrangement in which the released receiver hook automatically changes the circuit, cutting out the instrument on the line in a direction opposite to central and forming the circuit from the ground or return wire through the telephone-- box to the central or intermediate telephones.

I will describe a telephone-circuit embodying my invention and then point out the novel features in the appended claims.

Reference is to be hadto the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional View of a portion of a telephone-box, showing a switch mechanism embodying my invention as applied thereto. Fig. 2 is a side View of the switch. Fig. 3 shows a portion of the switch-operating rod. Fig. 4 is a diagrammatic view of the system. Fig. 5 shows a switch of modified construction, and Fig. 6 is a diagrammatic view of a system in which the modified switch is employed.

Referring to the drawings, 1 designates a portion of a telephone-box, through an opening 2 in which the receiver-hook 3 extends. Arranged on the inner side of the box are contact-plates 4 and 5, either one of which is adapted to be engaged by a contact-plate 6, mounted on a block 7, of insulating material, mounted to swing on the inner side of the wall of the box. Connecting with the block 7 and extended down at the outer side of the box is a shifting rod 8, which has a loop portion 9, through which the receiver-hook 3 passes, the said loop being of sufficient length to permit of an upward movement of the hook 3 for operating or shifting the rod. The contact-p1ate 6 has its ends bent in wedge-like form to engage with the correspondingly-bent end of the contacts 4 and 5, thus forming a locking connection between the contacts that will prevent accidental detachment.

From the contact4 a line-wire 9 extends to the central office and from the contact 5 a shunt-wire 10 leads to a connection with a line-wire 11, leading in an opposite direction to that of the central, both of the Wires 9 and 11 coacting with a return-wire 12. The contact 6 is normally in engagement with the generator 13 and the bell 14 through wires 15 and 16, and the said contact 6 is also in connection with the receiver 17 through the wire 18, which connects with the secondary 19 of the induction-coil, and this induction-coil is in connection with the transmitter 20 in the usual manner.

The receiver-hook 3 is normally in engagement with contacts 21 and 22, the contact 21 being in the bell and generator circuit, while the contact 22 is in connection with the line- Wire 11. Adapted to engage with the hook 3 when the receiver is removed therefrom are the contacts 23, 24, and 25. The contact 23 is connected to the return-wire12 by means of a wire 26. The contact 24 is in electrical connection with the induction-coil through a wire 27, while the contact 25 is in connection with the local battery 28 through a wire 29,

said local battery being in the transmitter- I circuit. While the hook 3 is in engagement with the contacts 21 and 22 the ringing-circuit is completed-that is, upon operating the generator the current will pass through the bell, the contact 21, the book 3, the contact 22, thence through the wire 11, back through the wire 12 tothe central and then through the wire 9, the contact 6, and the wire 15 back to the generator.

Upon removing the receiver the hook 3 will move up, making'contact with the contacts 23, 24:, and 25, while the contact-plates i and 6 still remain in engagement. At this time the talking-circuit is connected to the central. Should it be desired to talk in a direction opposite to central, the rod 8 is to be moved upward, moving the contact 6 out of engagement with the plate 4 and into engagement with the plate 5. It will be seen that the lower end of the push-rod 8 is curved slightly outward, so that it can be convom' ientlygrasped by a persons finger for the purcuit through the contacts 24 and and the secondary of the induction-coil and also closing the circuit through the contacts 23 and 24, line 26, line 12, line 11, line 10, contacts 5 and 6, and thence through the induction-coil to the transmitter.

Upon replacing the receiver 17 the rod 8 will be drawn down, thus automaticallyrestoring the ringing-circuit.

Should a party at an intermediate phone attempt to listen, upon removing his receiver it cuts out the party in the direction from central, and such listener taking off his receiver is in talking-circuit with the party in the direction of central. He cannot listen to the conversation because he cuts out one of the parties to the conversation, and therefore there is no possibility of listening to or hearing the conversation between the two originally-connected phones, and such removal of an intermediate receiver will cause but a momentary delay, as the party moving it will upon finding busy line instantly replace it, thus again closing the original circuit.

As before mentioned, a main idea of the invention is that the released receiver-hook automatically changes the circuit, cutting out the instruments on the line in a direction opposite to central and forming the circuit from the ground or return wire through the telephone-box to central or intermediate phones with a supplemental switch, as indicated in Figs. 1 and 2, which when the plate 6 contacts with the plate 5 cuts out central and intermediate instruments and forms a talking-circuit in a direction opposite central.

Ihe arrangement shown in Fig. 6 differs but slightly from that shown in Fig. 4that is, the arrangementin Fig. 4is fora two-partyline telephone (but may be used for a fourparty line) which leaves an open circuit for telephones not in use, while the switch in Fig. 6 closes the circuit for use of other parties on a four-party line, so that different sections of the same line may be in use at the same time.

In Figs. 5 and 6 the pendulum-switch 30 is held by means of a spring 31, carrying a contact 32, and a spring 33 is so engaged with the switch-lever that when the receiver releases the receiver-lever 3 said lever forces the levcr 30 to the left or to one side, making a talking-circuit toward central and at the same time closing the circuit for use of telephones in the opposite direction. Pressure exerted upon a push-button 34 when taking the receiver oif the hook forces the switch-lever 30 to the right by the agency of the receiver-lever, and the talking-circuit is in a direction opposite to central, and at the same time a circuit is closed for the use of central and in termediate phones, the hanging up of the receiver restoring the switch to its normal position.

To make the operation, reference may be made to Fig. 6, in which the ringing-circuitis by line 0 to spring 31 and contacts 32 and 35, through the generator-shunt and bell to the contact 21, through the receiver-lever to the contact 22 and out by the line 11, returning by the line 12. On removing the receiver after ringing the contacts 21 22 are broken, cutting out the line 11 and closing the transmittercircuit through the contacts 24 25 and the secondary and line circuit through the contacts 23 24, lines 26, 12, and 9, contacts 32 35, the receiver, and the induction-coil.

By depressing the double-pole switch 30 contact is made by the contact 36 with the plate 4, completing the circuit through the lines 10, 11, 12, 26, and 37, the contact 35 remaining on contact 32, leaving the talkingcircuit unchanged. By raising the switch 30 the contact 36 makes contact with contact 32, completing the circuit through the lines 37, 26, 12 and 9, and the contact 35 breaks contact with contact 32 and makes contact with plate 5, completing the talking-circuit through the lines 10, 11, 12 and 26, contacts 23 24, the induction-coil, and the receiver.

It will thus be seen that by depressing the switch a subscriber may talk on the line leading to the central and at the same time close the circuit for use of subscribers on the balance of the line, and by raising the switch the subscriber can talk over the line opposite to that leading direct to central and at the same time close the line for the use of central or intermediate telephones.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a telephone circuit or system,a switch,- comprising two contact-plates having connec tion with the main line, a .movable contactplate adapted for engagement with either one of the first-named contact-plates, a receiver hook and a shifting rod extended from said movable contact plate and having a loop through which the receiver hook passes,- whereby said receiver hook may move upward without imparting motion to the rod, the said receiver-hook operating to close the calling-circuit when moved downward, substantially as specified.

2. In atelephone circuit or system, two contact-plates arranged within a telephone-box and having connection with the main line, a movable contact-plate adapted to be engaged with either one of said first-named contactplates and adapted to interlock therewith, a swinging block on which the movable con tact-plate is mounted, a receiver-hook, and a shifting rod extended from said block down the outer side of the box and having a loop portion through which the receiver hook passes,the said receiver-hook causing the 010s ing of the calling-circuit when moved downward, substantially as specified.

3. In a telephone, a circuit-changer COIII- prising contact-plates connecting with the main circuit, a movable contact-plate adapted for engagement with either one of the firstnamed contact-plates, a receiver-hook, a shifting rod extended from the movable contactplate, and a loop on the end of said shifting rod, through which the receiver-hook of the telephone passes and in which the said hook may move upward Without imparting motion to the rod, but upon a downward motion of which will shift the rod to close the ringingcircuit, substantially as specified.

-l. I11 a telephone system, circuits leading in opposite directions from a telephone, areceiver-hook on the telephone, contacts closed for one line by the upward movement of the hook, and contacts in the opposite line closed upon a downward movement of said hook, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE E. GOODI'IEAD.

Witnesses:

J AS. ALLWARD DAY, ALONZO ELLIS. 

